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Functional dichotomy in spinal- vs prefrontal-projecting locus coeruleus modules splits descending noradrenergic analgesia from ascending aversion & anxiety in rats

机译:脊髓-前额叶投射蓝斑模块中的功能二分法将降压的降肾上腺素能镇痛从大鼠的厌恶和焦虑上升中分离出来

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摘要

The locus coeruleus (LC) projects throughout the brain and spinal cord and is the major source of central noradrenaline. It remains unclear whether the LC acts functionally as a single global effector or as discrete modules. Specifically, while spinal-projections from LC neurons can exert analgesic actions, it is not known whether they can act independently of ascending LC projections. Using viral vectors taken up at axon terminals, we expressed chemogenetic actuators selectively in LC neurons with spinal (LC:SC) or prefrontal cortex (LC:PFC) projections. Activation of the LC:SC module produced robust, lateralised anti-nociception while activation of LC:PFC produced aversion. In a neuropathic pain model, LC:SC activation reduced hind-limb sensitization and induced conditioned place preference. By contrast, activation of LC:PFC exacerbated spontaneous pain, produced aversion and increased anxiety-like behaviour. This independent, contrasting modulation of pain-related behaviours mediated by distinct noradrenergic neuronal populations provides evidence for a modular functional organisation of the LC.
机译:蓝斑轨迹(LC)遍布整个大脑和脊髓,是中央去甲肾上腺素的主要来源。尚不清楚LC是否在功能上充当单个全局效应器或离散模块。具体而言,虽然来自LC神经元的脊柱突起可发挥镇痛作用,但尚不清楚它们是否能独立于上升的LC突起起作用。使用在轴突末端摄取的病毒载体,我们在具有脊柱(LC:SC)或前额叶皮层(LC:PFC)投影的LC神经元中选择性表达了化学发生致动器。 LC:SC模块的激活产生了稳固的,横向的抗伤害感受,而LC:PFC的激活则产生了厌恶感。在神经性疼痛模型中,LC:SC激活降低后肢致敏性并诱导条件性位置偏爱。相比之下,LC:PFC的激活加剧了自发性疼痛,产生了厌恶感,并增加了类似焦虑的行为。由不同的去甲肾上腺素能神经元群体介导的疼痛相关行为的这种独立的,相反的调节为LC的模块化功能组织提供了证据。

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